US3763272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible phenolic carbamido resins
Assignee: Hooker Chemical Corp
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Filing: 1971-03-29
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Granted: 1973-10-02
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Expires: 1991-03-29
Abstract
Abstract FLEXIBLE THERMOSETING PHENOLIC RESINOUS COMPOSITIONS, USEFUL AS COATINGS, ADHESIVES, RUBBER TACKIFIERS, REACTION PLASTICS AND DILUENTS AND THE LIKE, ARE PREPARED BY CONDENSING A POLYMER CONTAINING A SEGMER HAVING AT LEAST ONE DISPLACEABLE HYDROGEN ATOM ATTACHED TO A CARBAMIDO NITROGEN FUNCTION, SUCH AS POLYAMIDE, WITH ALDEHYDE IN THE PRESENCE OF AN AROMATIC COMPOUND CONTAINING AN ORTHO-PARAACTIVATING GROUP, SUCH AS PHENOL, AND HYDROGEN BONDING SOLVNT AT A PH LESS THAN 7 AND AT A TEMPERATURE BETWEEN ABOUT MINUS 20 AND ABOUT 200 DEGEEES CENTIGRADE, AND RECOVERING THE PRODUCT SO PRODUCED.
Inventors
- 👤 Ki Lee Sung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:41
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/38; C08G69/00; C08G69/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |